Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20109w&link_type=abstract
Spitzer Proposal ID #20109
Physics
Scientific paper
Many cosmic dust materials exhibit identifying spectral features in the infrared, and laboratory work has provided detailed infrared optical properties for numerous materials of astrophysical importance. Thus, the Spitzer Space Telescope is a powerful tool for determining the grain constituents in a wide range of cosmic environments, including protoplanetary disks, outflows from evolved stars, supernovae, star-forming regions, and active galactic nuclei. Dust is important both in the physics of these objects and as a diagnostic. For example, dust absorbs short-wavelength radiation and re-emits at longer wavelengths, and often dominates the heating or cooling of the gas. Thus, detailed interpretation of the spectrum, originating in both gas and dust, is only possible if the optical properties of the dust materials are known across the entire electromagnetic spectrum. We propose to construct X-ray to far-infrared (FIR) dielectric functions for a host of important dust materials, consistent with all available constraints (from laboratory data, basic physical principles, and astronomical observations). These materials include a variety of silicates, oxides, and sulfides. The optical properties will be made available on the World Wide Web and will be incorporated into the spectral simulation code CLOUDY.
Ferland Gary
Weingartner Joseph
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